Brake mechanism



March 25 1924.

W. C. STEWART BRAKE MECHANISM 2 Sheets-Sheet l Original Filed May l5Vf/V TML fw@ JM March 25 1924,

1,487,763 W. c. STEWART BRAKE MEcHANIsM' Original Filedf May l5, 191e 2sheets-.sheet 2- Figf.

1 /A/ l/[A/ TUAL za Fatented Z5, i924-,

WILLIAM C. STE-WARE OF S'W'AMPSGOT'I, MASSACHUSETTS, ASSIGNOR- TO UNITEDSHOE MACHINERY CORPORATION, OF 'RATER-SON, ,NEVI JERSEY, A CORPORATIONOE NEW JERSEY.

BRAKE MEGHANISVI.

@riginal application led May l5, 1916, Serial No. 97,583. Divided and,this application filed July 2, 1920. Serial No. 393,598.

To fr? ,f I.1v/720m. t 'may conce/rn Be it known that l. Eliminar C.S'inwnn a subject oi the King of England` residing at wampscott, in thecounty oi Essex and State ot' Massachusetts, have invented certainimprovements in Brake Mechanisms, ot which the following description,in, connection with the accompanying drawings, is a specification, likereference characters on the drawings indicating like parts in theseveral figures.

This invention relates to machine controlling mechanisms and moreparticularly to stopping or braking mechanisms for bringing machineparts to rest when the driving clutch or other driving element isdisengaged trom the source ot power.

The present ai'iplicationis a division ot application Serial No. 97,583,iled May 15, 1916, which has matured into Patent No. 1,429,302.September 19, 1922, in which is shown, in connection with the brakingmechanism. a stopping and starting mechanism of general utility designedto provide positive insurance against accidental repetition of theoperative. movements of the machine in which it is embodied.

lt is an object of this invention to provide a brake or stop mechanismwhich is especially simple in construction and eihcient in operationwhich is applied yieidingly so as to avoid excessive shock and minimizethe strain upon the operatng parts of the brake` but which operates tobring the parts of the machine to rest accurately7 and without delay inthe same predetermined relation after each operation, and to .improveotherwise upon prior constructions of this type of mechanism.

An important feature of the invention resides in the provision of abrake band arranged to surround a brake drum mounted in eccentricrelation to its axis of rotation and to be tightened by the action ofthe drum.

In the drawings Fig. 1 is a View in end elevation of the lower portionof a gearless sole cutting machine showing the brake drum and the brakeband of the illustrative construction in` solid lines instead of indotted lines as in the parent case;

Fig. 2 1s a view in front elevation, with portions broken away and otherportions shown in verticalsection, of the lower portion ,of a gearlesssole cutting machine including mechanism in which the invention isembodied; f

Fig. 3 is a diagrammatic View illustrating the operation ofthe brake;and

Fig. 4 shows in detail a portion of the brake operating means.

The machine in which mechanism embodying this invention is shown asincorporated comprises upright frame castings 2 at opposite endsconnected at the front and the back by cross-pieces 4. The framesupports in the usual w y a cutting block (not shown) upon which a sheetof stock is placed in position. for the dieing-out operation. The endcastings 2 are provided with bearings 6 for four vertical rods 8 whichsupport at their upper ends in the usual Way a platen or beam (notshown) which extends over the cutting block. The rods 8 are connected attheir lower ends by yolres 10, and on each yoke is pivoted a pitman 12which embraces an eccentric 14: on a driving shaft 16, the shaftextending longitudinally of the machine beneath the cutting block androtating in bearings in the trame castings 2. 1n the 'normal stationarypositions of the Vparts the high points of the eccentrics 14 are abovethe shaft 16 in substantially Y `vertical alinement with the center ofthe shaft. thus holding the beam upraised from the cutting block inposition to permit a die to be placed in the desired location upon thestock. In the operation of the machine, after the die has been properly7positioned, the shait 16 is caused to make a single revolution, thuslowering the beanr into engagement with the die to effect a cuttingoperation and then returning the beam to its starting position.

At one end of the shaft 16 is a brake' 'for stopping the rotation of theshaft in the desired position, the brake comprising a drum 24 secured tothe sha-ft and a flexible band 26 which in the construction shown almostcompletely encircles the drum. The band is anchored at one side oit' thedrum on an arm 28 which is pivoted on a stud 30 projecting Jfrom thecasting 2, the arm 28V being pivotally Yconnected' to a shoe 32 which issecured to the band, :,Pivotally mounted of the shaft 16, the pawl 116lifts and passes idly by the teeth of the ratchet wheel 80, but

on the upward movement of the rods 8, after the cutting operation hasbeen effected, the pawl 116 engages a tooth -of the ratchet wheel 8O andcauses the shaft 68 and the controller wheel 60 to turn the requireddistance to operate the bell crank 06 and thus stop the machine. rThebracket 114 is adjustable on the rod 8 to permit the pawl 116 to beproperly positioned. It will be apparent that the operator may safelykeep the ti'eadle depressed until after the upward movement of the pawl116, since the teeth on the wheel 8O will pass idly by the pawl 88.Before starting the machine a second time it is necessary to release thetreadle and permit it to swing to its limit of upward movement. For a.incre-detailed description of the treadle-operated parts referenceshould be had to the pai'ent case referred to above.

In the normal operation of the machine the operator depresses thetreadle 96 and through the action of the pawl 88 on the ratchet wheel80, turns the shaft 68 and the controller wheel 60 far enough to permitthe roll 58 to drop into the next succeeding de pression 62 on thewheel, thus permitting the spring 66 to act upon the rod 52 to set theclutch (not shown) and release the brake. The shaft 16 is thus set inmotion and through the eccentrics 14 and the pitman 12 depresses therods 8 and the beam (not shown) to cause the beam to act upon the workand then raises the rods to return the beam to the starting position.During the latter portion of the upward movement of the rods 8 the pawl116 engages the ratchet wheel 8O to turn the shaft 68 to carry the nextsucceeding cam 64 on Vthe controller wheel 60 beneath the roll 58, thusoperating the bell crank 56 to release the clutch andset the brakewhereby the parts are brought to rest in starting position.

While the various features of the invention. includingthe novel bra-kingmeans, are shown and described herein as applied to a machineparticularly designed for cutting' soles or the like, it should beunderstood that the inventio-n is not thus restricted in utility but isapplicable tomachines of various types.

Having described the invention, what I claim as new and desire to secureby Letters Patent of the United States is 1. In a machine of the classdescribed, the combination with a shaft, of abrake drum on the shaft, abrake band on said drum, means for applying the brake comprisingconnections to opposite ends of said band for tightening the band on thedrum, the drum being eccentric to the shaft, and means for operating thebrake applying means at such time in the rotation of the shaft as tocause the drum to operate said connections to increase the braking'action of the band; p v i 2. In mechanism of the class described, thecombination with a shaft, of a brake drum on the shaft, a brake bandon'said drum, means for applying the brake com prising connectionsbetween opposite ends of said band and rod for operating saidVconnections to tighten the band on the drum, the drum being eccentric tothe shaft, and means for operating said rod to apply the brake at suchtime in the rotation of the shaft as to cause the drum to operate saidconnections relatively to the rod t`o increase the braking action of theband.

In mechanism of the classl described,

the combination with a shaft, of a brake drum on the shaft, a brake bandon said drum, means for applying the brake comprising a bell crankpivoted on one end of said band, a link connecting one arm o-f said bellcrank to the other end of the band and means connected to the other armof the bell crank for operating the bell crank to tighten the band onthe,y drum, the drum being eccentric to the shaft, and means foroperating the brake applying means at such time in the rotation of theshaft as to cause the drinn to turn the bell crank relatively to itsoperating means toincrease the braking action of the band.

4. In mechanism of the class described, the combination with a.shaft,`o=f a brake drum on the shaft, a brake band on said drum, meansfor pivotally supporting the brake band at one side of the drum topermit it to swing in vthe plane of the drum` means for applying thebrake comprising` Y connections between opposite ends of the brake bandat'tlie opposite sidev of the drum from said pivotal support and a rodfor operatingr said connections to tighten the band on the drum. thedrum being eccentric to the shaft, and means for operating said rod toapply the brake at such time in the rotation ofthe shaft as to cause thedrum tor swing the band about its supporting means and operate saidconnections relatively to the rod to effect a further tighteningof theband.

5. In mechanism of the class described, the combination with a shaft, ofa brake drum eccentrically mounted on the shaft, a brake band on saiddrum.` and means for applying the brake comprising connections toopposite ends of the band for tightening the band on t-he drum, saidconnections including parts relatively movable against yieldingresistance for absorbing the shock incident to the application of thebrake.

6. In mechanism of the class described, a' rotatable brakeV drum mountedin eccentric relation to its axis of rotation, a brake band on saiddrum, and means connected to said 4, Les

action of the drum.

7. In mechanism ot the class described, a rotatable brake drum mountedin eccentric relation to its axis ot rotation, a brake band on saiddrum, brake applying means connected to said band, and mechanism foroperating said brake applying means to tighten the band on the drinn,said brake applying means being so constructed and arranged in rela-tionto said drinn and operating mechanism as to cause said means be operatedby the eccentric drinn to increase the braking action of the band.

8. In mechanism of the class described, a rotatable brake drum mountedin eccentric relation to its axis of rotation, a brake band on saiddrum, and means for tightening said band on the drinn at such a point inthe cycle of rotation ot the drinn as to cause the band to be furthertightened by the action of the eccentric drum.

9. In mechanism of the class described, a rotatable bake drum mounted ineccentric relation to its axis of rotation, a brake band on said drinn,a member connected to the band for tightening the band on the drum, andmechanism for operating said member to tighten the band at such a pointin the cycle of rotation of the drum as to cause movement of said memberrelatively to its operating mechanism to be effected by the action or'the eccentric drum for further tightening the band on the drum.

l0. In mechanism of the class described, a rotatable brake drum mountedin eccentric relation to its axis of rotation, a brake band encirclingthe drum, brake applying means connected to said band, and mechanism foroperating said brake applying means to tighten the band on the drum at apredetermined point in the cycle of rot-ation of the drum.

l1. In mechanism of the class described, a rotatable brake drum, a.brake band on said drum, means for supporting the band in such manner asto permit it to move bodily in the plane of the drum, the drum beingmounted in eccentric relation to its axis ot rotation, brake applyingmeans connected to the band, and mechanism for operating said brakeapplying means at such a point in the cycle of rotation of the drum asto cause said means to be further operated by bodily movement of theband in such manner as to increase the braking action of the band.

l2. In mechanism of the class described, a rotatable brake drum, aco-operating brake member for engaging the periphery of said drinn tostop the rotation oit the drinn, the drum being mounted in eccentricrela-tion to its axis ot rotation, and means for operating said memberat such a point in the cycle of rotation of the drum as to canse theco-operative braking pressure between said drinn and member to beincreased by the act-ion of the eccentric drinn.

13. In mechanism of the class described, a rotatable brake drum, aco-operating brake member for engaging the periphery of said drum tostop the rotation of the drinn, the drinn being mounted in eccentricrelation to its axis or" rotation, and mechanism for operating saidmember to render its braking ac- Y tion effective at a predeterminedpoint in the cycle of rotation of the drinn.

14. In mechanism of the class described, a rotatable brake member havinga substantially annular brake surface encircling the axis of rotation ofsaid member in eccentric relation to said axis, a co-operating brakemember arranged to engage said surface, brake applying means connectedto said last named member, and mechanism for operating said bra-keapplying means at such a point in the cycle of rotation of said firstnamed member as to cause the rst named member to operate said means toincrease the braking pressure.

l5. In mechanism of the class described, a. rotatable brake memberhaving a substantially annular brake surface encircling the axis ofrotation of said member in eccentric relation to said axis, aco-operating brake member arranged to engage said surface, and mechanismJfor operating said last named member to apply braking pressure at apre# determined point in the cycle of rot-ation of said lirst namedmember.

In testimony whereof I have signed my name to this specification.

WILLIAM C. STEWART.

